Boring-machine.



Patented Mar. 18, 1913'.

/2 SHEETSSHEET 14 4 w Z 9' v E 29 h 17 I 6;? Y 60 qwm r" m *5 24mma'muawtoz A T. J. WATKINS.

BORING MACHINE. APPLICATION TILED DEG.6,1911.

Patented Mar. 18, 1913 2 SHEETSSHEET 2 nucnboz i i macaw 12 5 5 THOMASJ. WATKINS, OF RICHMOND, VIRGINIA.

BORING-MACHINE.

Specification of Letters Patent.

Patented Mar. i s, an 3.

Application filed December 6, 1911. Serial No. 664,299.

To. all whom it may concern Be it known that I, THOMAS J. Wxrmxs, acitizen of the United States, -residing at. Richmond, in the county ofHenrico and State of Virginia, have invented certain new and usefulImprovements in Boring-Machines, of which the following is aspecification.

My-invention relates to in'lprovements in boring machines.

The object of my invention is to provide a machine for boring holes injoists or walls where it is impossible to use the ordinary auger, and itis more particularly designed for electric wiring purposes.

Another object of my invention is to pro vide'a machine of thischaracter which can be operated from the ground or floor and in whichthe operation thereof tends to cause the feeding or rorcing of the bitforward to cause it to cut. I

Another object of my invention is to provide a simple, cheap andeffective machine having certain details of structure hereinafter morefully set forth.

In the accompanying drawingsl igure 1 is a side elevation of my improvedmachine in operation; Fig. 2 is an enlarged vertical transversesectional view of the bit operating mechanism; Fig. 3 1s a detachedperspective view of the two drive gears mounted upon the bit shaft andshowing the arrangement of the clutch mechanism; and Fig. 4 is avertical sectional view taken at right angles to Fig. 2.

Referring now to the drawings, 1 represents a base which is adapted torest upon the floor and which preferably has pivoted thereto, at 2, arod 3, said rod telescoping in a tube 4 carried by the casing 5. Thesaid tube and rod are held in their adjustedposltion by means of aset-screw 6, whereby the casing carrying the auger operating mechanismmay be elevated or lowered, as desired.

The casing 5, as shown in Fig. 4, is of an elongated form having mountedtherein, at about the center, -a shaft 7, which has its ends mounted inbearings 8 secured on the out-side of the casing. Covering-the bearingsare caps 9, screwed thereon, as indicated at 10, and by means of whichtheyshaft 7 is lubricated. i

Keyed upon the shaft 7 is a sleew 11, havi ng'at its center a sprocketwheel 12 which the main drive of the. machine, as will be hereinaftermore fully described. Carried by the said sleeve on one side of thesprocket: 1.2 is a small gear 13, while on the opposite side of thesprocket, and carried by the sleeve is a larger gear 14. 'Mountcd in theupper end of the. casing a shaft 1.5, mounted in bearings 16 in the samemanner as the shaft 7, and the said bearings are closed by the screwcaps 17. Loosely mounted upon the said shaft 15 are two gears 18 and 19which have annular grooves 20 surrounding the shaft, the purpose ofwhich will be hereinafter more fully dcscribml. The gear 19 meshes withthe: gear 1 1 and is thereby driven in the l0\'(;.'-.( direction as theshaft 7 driven by the sprocket 1E2. meshes with an idle gear 21 mountedin the casing 5 and the idle gear in turn meshes with the gear 13. Bythis arrangement, it will be seen that the gear 18 is driven in theopposite direction to that of the gear 19.

The shaft lziis provided with two clutch members 22 and 23 which aresecured against rotation on the shafl and extend within the annulargrooves 20 of the gears 18 and 19. These clutch members, shown in Fig.3, have in their outer peripheries a series of canrsliaped recesses 2.3,the recesses'of both clutch members extending in the same direction.

Within the recesses of the clutch melnbers are rollers 27, the diametersof which are less than the greatest. depth ofthe recesses The rollersare held within the recess at one end by the gears 18 and 19, while theclutch members 22 and 23 have rcmovably secured thereto the rings 28 and29. The rollers 27 are normally held toward the small end of the recessby a coil spring 27. The outer end of the shaft 15 is provided with anextension 130, having a socket 210 to receive the auger :32, said augerbeing held in the socket by means of the set-screw 3-"). The lower endof the casing is provided with two shafts 34 and 35, which are parallelwith each other and art arranged at right angles to the shaft 7. Looselymounted upon each shaft. are two spools so and 37 which are free to movelongitudinally on their shafts. The casing between the shafts and in averti al alinement with the 38 and 39. lassingaround the sprocket 12 isa sprocket chain edwhich is preferably of an endless form and passesdownwardly between the oppositely arranged pairs of The gear 18 sprocket12 is provided with two openings rollers 36 and 37 of the shafts 34 and35 and through the openings 38 and 29 in the casing.

In operation, the base 1 is placed upon the floor adjacentthe joistor-wall in which it is desired to bore the hole. The casing is adjustedthe proper length and lo cked by the set-screw 6. The operator thenstands upon the side of the support or casing which carries the hit and.by drawing down upon thachain first on one side and then on the other,the sprocket 12 is caused to oscillate. When moving in one direction thegear 1.4 drives the gear 19 and the rollers 27 travel toward the smallend of the recesses in the clutch member and the shaft 15 is locked tothe gear and which in turn operates the bit. Uponthe movement of thesprocket 12 in the opposite direction the rollers 27 travel to ward thelarger end of the recesses and the gear 19 is unlocked from the shaft15. Simultaneously with this operation the gear 13 rotates the idle gear21, which in turn rotates the gear 18 and the rollers lock the gear 18through the'olutch member 22 to the shaft 15 and the said shaft 'iscaused to continue its rotation in the same direction.

From Fig 1, it will beseen that the pull upon the chain will tend tofeed the bit and by operating the device with both hands causes a morerapid and steady rotation of the bit. The chains engage the rollers 36and 87, which'prevent it from engaging the walls of the openings88 and39 when the pull on the chain is not straight and allows a free movementthereof.

Having thus fully described my invention, what I claim as new and desireto secure by Letters Patent isw r 1. A boring machine, comprising acasing, a bit shaft in the casin a gearing in the said casing fordriving tie shaft, a sprocket chain driving the gearing by its movementin either direction and causing the bit shaft to rotate in the samedirection, and passing loosely down through casing and adapted to bemoved laterally and sprocket spools carried by the lower end of thecasing and having their axes at right angles to that of the sprocketwheel and between which the chain passes.

2. A boring machine, comp ising a casing,

a support for the casing, a shaft within the ring, a bit socket carriedby the shaft, a gear loosely mounted upon the said shaft meshing withthe idle gear, a clutch mechanism for looking the gear on the shaft inone direction, a second gear carried by the shaft for meshing with thelarger gear carried by the sprocket shaft, a clutch mechanisn'i forlocking the gear on the shaft in the same direction as the clutch of theother gear, a sprocket chain passing around the sprocketand extendingdownwardly through the cars ing.

3. A boring machine, comprising a casing, a vertically adjustablesupport for the casing, a shaft carried by the lower end of the casing,a sprocket secured upon the shaft, 2 second shaft mounted in the upperend of the casing, a bit socket carried by the outer end of the saidshaft, the lower end of the casing having 'two openings in alinementwith the periphery of the sprocket, two shafts carried by the casing andextendii'lg at right angles to the sprocket shaft on opposite sides ofthe openings in the casing, a spool carried by each shaft on oppositesides of the openings, a gearing carried by the sprocket shaft forrotating the bit shaft in the same direction by the movement of thesprocket shaft in either direction and an endless sprocket chain passingover the sprocket, and passing downwardly between the spools and throughthe openings in the casing.

In testimony whereof I affix my signature in presence of two witnesses.

THOMAS J. (ATKINS Witnesses:

S. H. Evans, W. W. NEALE.

